Trackback is a system used to associate posts on different blogs and, in a greater sense, it allows blogs to “share” readers.
An example! Just as a simple example of how Trackback works: If you have just posted an article discussing Admiral Byrd’s second Antarctic Expedition and then happen to run across a similar or related post on another blog, you could use the Trackback mechanism to notify the other poster of the existence of your post. When your Trackback notification (which is the permalink to your post and, possibly, some basic information about your blog) appears on the post in the other blog that blog’s readers will also be notified that you have something to say on the subject and they may pay you a visit.
Everyone can have it but not everyone does! Some blogs have this Trackback capability built in and others do not but the good news is that Haloscan, a very popular comment tracking program, now offers a Trackback feature for those who don’t have it and the better news is its FREE! If you are interested you can go to